Gypsum Fine Grade | Grain Spawn Substrate Supplementation

Sourced from food-grade mineral additive essential for both mushroom growers and soil enthusiasts. This fine-grade calcium sulphate is a staple in the mycology world, trusted by cultivators to improve the quality of grain spawn and promote robust mycelial health from the very first stage of growth. The Mycology Essential: Why Use Gypsum? In mushroom cultivation, the physical structure of your substrate is just as important as its nutrient content. Our Gypsum is ultra-fine and food-safe, making it perfect for evenly coating and mixing through hydrated grain prior to sterilisation. One of its primary roles is acting as an anti-clumping agent; it keeps individual grains separate, which significantly increases the number of inoculation points and allows for faster, more even colonisation. Beyond texture, Gypsum provides essential calcium and sulphur—two key nutrients that act as building blocks for vigorous mycelium growth and help stabilise the pH levels of your substrate. Benefits for Soil and Garden Health While it is a "must-have" for the lab, Gypsum is equally valuable in the garden. It is a fantastic soil conditioner that helps break up heavy clay soils without altering the pH as dramatically as lime. By adding this mineral to your garden beds, you improve water penetration and aeration, creating an environment where roots—and beneficial soil microbes—can truly thrive. Quality You Can Trust Whether you are prepping jars for a gourmet grow or amending your backyard soil, our Gypsum offers a clean, reliable, and natural solution. It integrates seamlessly into any growing medium, ensuring your fungi and plants have access to the minerals they need for high-yield harvests and long-term vitality.